Thomas potterton



(NQ Model.)

T. POTTBRTON. SAFETY VALVE FOB. BOILBRS'.

Patented Oct. 20, 1896.

WITNESSES cfg gw/Z9 5%/ ATTORNEK UNITED STATES PATENT OFFICE.

THOMAS POT"ERTON, OF LONDON, ENGLAND, ASSIGOR TO ALBERT BELTONPOTTERTON, OF SAME PLACE.

SAFETY-VALVE FOR BOLERS.

SPECIFICATION forming part of Letters Patent No. 569,670, dated October20, 1896.

Application filed May 8, 1896, Serial No. 590,699. (No model.)

To @ZZ whom t may concern.-

Be it known that I, THOMAS PorrEnroN, a citizen of Great Britain, and aresident of London, in the county of Surrey, England,

steam-boilers, Water-boilers, and for general use in heating apparatus;and the object thereof is to provide an improved device of this classWhich is simple in construction and operation and which is provided witha hollow spindle, with which is connected an escape valve or cock, bymeans of which the Water or steam can be drawn off when the cock isopen, thus indicating the condition of the valve and Whether it is inoperative condition.

The invention is fully disclosed in the following specification, ofwhich the accompanying drawings form a part, in which Figure l is a sideelevation of my improved safety-valve 5 Fig. 2, a central verticalsection thereof; Fig. 3, a side elevation of a modified form ofconstruction, and Fig. l a central vertical section thereof.

In the practice of my invention I provide a tubular head A, by which myimproved valve may be connected with a boiler, hot-Water heater, or anysimilar device, and said tubular head is provided with an enlargedcasing a, at the base of Whichis formed an annular chamber a2, in thebottom of which are formed blow-holes CL3, and said enlarged casing c isprovided With a cap B, which is mounted thereon and connected therewithby means of a screw-thread, and passing centrally through said cap is ahollow spindle D, the lower end of which is provided with a port oropening` d and an annular shoulder or flange d2, below which is placedan annular cap d3, which is adapted to hold in place an annularpacking-ring d4, which may be composed of vulcanite or any preferredmaterial, and which constitutes a valve whichis adapted to be seatedupon the upper end of the tubular head e as clearly shown in Fig. 2, andmounted on the hollow or tubular spindle D is a spiral spring E, one endof which bears upon the annular shoulder d2 and the other upon the capB.

The cap B is provided with a valve-casing O, in which is placed aplug-valve G, and the valve-casing O is provided with a tubularconnection II, Which is preferably curved, as shown, and through whichWater or steam may be discharged, and the cap B is provided with an.annular flange or shoulder K, which is milled or otherwise roughened onthe outer edge thereof, and which serves as means for connecting the capwith the casing a or detaching the same therefrom.

In Figs. 3 and 4 I have shown a modified form of this construction, inWhich the hollow spindle D is providedat its upper end with a three-wayhead L, to one side of which lis secured the valve-casing C, with whichis connected the pipe H, and the head L is pro vided at its upper sidewith an extension M, on which is mounted a plurality of Weights m, andthe Weights m serve, as will be understood, in place of the spiralspring E.

It will be understood that in both forms of construction the tubularspindle D is free to move through the cap B, and, whenever desirable,the valve Gr may be turned so as to admit of the discharge of Water orsteam, and when the valve is open if water escapes therefrom it Willindicate that the valve-seating is free from incrustation or ice, and ifWater does not issue through the valve it will indicate that somethingis Wrong therewith, and said parts may be disconnected and examined.

This device is simple in construction and operation and perfectlyadapted to accom plish the result for which it is intended, andI'reserve the right to make all such changes therein and modificationsthereof as fairly come within the scope of the invention.

Ilavin g fully described my invention, I claim as new and desire tosecure by Letters Patentl. The herein-described safety-valve which isprovided with a vertically-movable hollow spindle, the upper end ofwhich is provided with a valve or cock, and a discharge-pipe,substantially as shown and described.

IOO

2. rlhe herein-described safetywaylve which is provided with 'nvertically-moVahle hollow spindle, the upper end of which is providedwith :L valve or eoek, and a discharge-pipe, said hollow spindle `being`mounted in a oasing at the lower end of which is i valve-seat, on 'whichthe lower end of the spindle is adapted to he seated, substantially asshown and described.

The herein-described safety-valve which is provided with avertically-movable hollow spindle, the upper end of which is providedwith a valve or Cock, and a diselmrge-pipe, said hollow spindle being`mounted in a easing at the lower end of which is :L valve-seat,

on which the lower end of the spindle s adapted to he seated, and saidSpindle being` also provided with a spring which is mounied thereonwithin said casing, and which is adapted to force the same upon thevalveseat, substantially as shown and described.

In testimony that I Claim the foregoing as my invention I have signed myname, in presence of the subscribing witnesses, this 17th day of April,1896. y

THOMAS POTTERTON.

lVitnesses:

THOMAS T. ROGERS, ALFRED NUTTING.

